MMU-16LE
SmartMonitor
Operations Manual
Eberle Design Inc.
Page 18
In Type 16 mode, the next steps pinpoint known faulty signals. Type 12 operation does not
have the benefit of Field Checking (screen #2) unless the
Type 12 with SDLC
mode
(Section 1.4.2.1) is selected, so the MMU-16LE
SmartMonitor
®
does not have enough
information to actually identify the faulty signals. The last step offers the technician several
suggestions for the cause of the malfunction.
Pressing the HELP button or the NEXT button will sequence the display through this series
of steps. At any point the EXIT button will return the display back to the normal display
mode. The figures above show a simple example of the Diagnostic Wizard screens for a
Conflict fault.
3.11 FLASHING YELLOW ARROW PROTECTED-PERMISSIVE MONITORING (FYA)
The MMU-16LE
SmartMonitor
®
is designed to monitor an intersection with up to four
approaches using the four section Flashing Yellow Arrow (FYA) movement outlined by the
NCHRP Research Project 3-54 on Protected/Permissive signal displays with Flashing
Yellow Arrows. For monitoring purposes an FYA approach is logically defined as a four
input “channel” consisting of the solid Red Arrow, solid Yellow Arrow, flashing Yellow Arrow
(permissive), and solid Green Arrow (protected).
- NOTE -
EDI does not provide any guidelines, warrants, or recommendations for the use of
protected/permissive left-turn phasing. The underlying assumption is that the traffic
engineer has decided that this form of protected/permissive control is the most
appropriate left-turn treatment, and all necessary considerations have been made.
Until official rulemaking action by the MUTCD has occurred, the operation and
functional parameters of the MMU-16LE
SmartMonitor
®
FYA and FYAc modes are
subject to change.
Two cabinet configurations are supported for both the MMU Type 16 and Type 12 modes
depending on the number of load switches provided and the capabilities of the Controller
Unit. A Flashing Yellow Arrow approach is actually monitored using two physical channels
of the MMU-16LE
SmartMonitor
®
. In the basic FYA mode of the unit, one additional load
switch is required for each FYA approach to be monitored. Thus a TS-2 cabinet providing
four vehicle phases, four pedestrian phases, and four FYA approaches would require
sixteen load switches. The compact FYAc mode requires the Controller Unit to remap the
Yellow outputs of the pedestrian load switches to drive the protected Green Arrow signals
of the FYA approaches. In this mode the cabinet can provide the four FYA approaches with
the existing twelve position back panel. Configuration settings are described in Section
6.3.14.
In the description of the two modes below, channel numbers are shown for the Type 16 TS-
2 mode of the MMU-16LE
SmartMonitor
®
.
Channel numbers shown in brackets “[ ]”
refer to the respective channels when operating in the Type 12 TS-1 mode
(see
Section 1.4.2).
3.11.1 BASIC FYA MODE
The cabinet must be wired such that for each FYA approach, the solid Green protected
Arrow is driven by a load switch monitored on channels 1, 3, 5, and 7. The associated solid
Red Arrow, solid Yellow Arrow, and flashing Yellow Arrow (FYA Overlap phase) must be
driven by a load switch monitored on channels 13, 14, 15, and 16 [9, 10, 11, 12]
respectively. The MMU-16LE
SmartMonitor
®
associates channel 1 with 13 [9], channel 3
with 14 [10], channel 5 with 15 [11], and channel 7 with 16 [12] when FYA monitoring is
enabled for that respective approach.
If a channel pair is enabled for FYA operation, the MMU-16LE
SmartMonitor
®
will monitor
the FYA logical channel pair for the following fault conditions:
a.
Conflict